Electric-arc lamp.



No. 761,182. PATENTED MAY 31, 1904. J. A. RIGNON.

ELECTRIC ARC LAMP.

APPLICATION FILED AUG. 21, 1902.. N0 MODEL.

Tn: Noam Pz' zas co, Pnmouma, wswmmu. n. c.

UNITED STATES Patented May 31, 1904.

PATENT OFFICE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 761,182, dated May 31, 1904.

Application filed August 21, 1902. Serial No. 120,586. (No model.)

To all whom it may concern:

Be it known thatI, J osnrn ALBERT RIeNoN, a subject of the King of Italy,whose post-office address is 91 LiitzowstrassaBerlin, Germany, have invented certain new and useful Improvements in Electric-Arc Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This present invention relates to an arc-lamp in which the chief importance is attached to a unifprm and easy regulating of the lamp insured by the arrangement of caps or the like retarding the movements of the upper carbon.

My invention comprises a base-plate and a central tube fixed to the base-plate, with a piston Working in the closed upper end of the tube, an upper-carbon holder carried by the piston, a grip device acting on the upper carbon, a piston-cap sliding on the tube and in a cap, a solenoid surrounding the central tube, and a core within the solenoid and guided on the tube and connected to the piston-cap and to the grip device.

The nature and'scope of my invention will be more fully understood from the following description, taken in connection with the accompanying drawing, forming part thereof, which shows a vertical central sectional View of an electric-arc lamp embodying main features of my invention.

Referring to the drawings, a represents a tube tightly closed at the top and having working therein a piston forming the holder it of the upper carbon. A cap f, mounted to slide on the upper end of the tube a, is connected by side rods 6 with the core 0 of a solenoid p,- surroundingthe central tube a. The cap f slides withinacap g, joined to the dome of the lamp-casing, which is carried on the plate 5. The clutch for the upper carbon is connected by a link in with the core 0.

d indicates the solenoid-winding.

m is a hole in the lower-carbon holder, an Z a back-stroke valve for allowing the escape of gases when the arc is inclosed.

The operation ofthelamp is asfollows: The

7 current enters the solenoid-core d, passes to the tube a, to the carbon-holder h, to the upper carbon, to the lower carbon, and its holder. In the tube a the piston, which is made of brass, for example, moves, which at the same time acts as the holder for the upper carbon. This piston-like sliding holder It has a retarding action on the movement of the carbon 71 when the latter moves downward, this effect resulting from the rarefying of theair in the upper space. Thecolumn of air lying below the piston it and heated by the arc also assists this retarding action. When not in action, the points of the carbon are in contact. On the other hand, when current is admitted to the lamp' the iron core 0 is drawn up by the soleniod d concentrically arranged, and in consequence of the oblique position of the clutch the carbon is correspondingly raised. The iron core 0 raises the rods 6 and cap f, sliding above the pipe a, this cap in turn sliding in the cap g and being subjected to a breaking effect both on being raised and lowered. By means of this arrangement an arc-lamp is produced-vvhich works quite slowly and smoothly, according to the number of the coils, and with suitable mounting this lamp may act as a primary circuit, shunt, or differential lamp.

What I claim, and desire to secure by Letters Patent, is'

In an electric-arc lamp, the combination of a main frame, comprising the lower base-plate and a central tube fixed to the base-plate, with a piston working in the closed upper end of the tube, the upper-carbon holder carried by the piston, a grip device acting on the upper carbon, a piston-cap sliding on the tube and in a cap, a solenoid surrounding the central tube, a core within the solenoid and guided on the tube, and connected to the piston-cap and to the grip device.

In testimony whereof I have aflixed my signature in presence of two witnesses.

JOSEPH ALBERT RIGNON. 

